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No. 624,360. Patented May 2, I899.

C. J. MELLIN. v

COMPOUND ENGINE.

(Application filed Apr. 23', 11998.

(N o M n d al WITNESSES: 'llvvg/vrofi MW I /W%W ATTORNEY.

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UNITED STATES PATE T OFFICE.

CARL J. MELLIN, OF RICHMOND, VIRGINIA, ASSIGNOR TO THE RICHMOND LOOOMOTIVE AND MACHINE WORKS, OF SAME PLACE.

COMPOUND ENGINE.

SPECIFICATION forming part of Letters Patent No. 624,360, dated May 2, 1899.

Application filed April 23, 1898. Serial No. 678,576. (No model.)

To all whom it may concern.-

Be it knownthat I, CARL J. MELLIN, a citizen of the United States, and a resident of Richmond, in the county of IIenrico and State of Virginia, have invented certain new and useful Improvements in Compound Engines, of which the following is a specification.

My invention relates to compound engines generally, but more particularly to compound locomotive-engines; and it consists of an improved construction of the receiver in the smoke-box of the boiler for superheating the exhaust-steam from the high-pressure cy1inder on its way to the low-pressure cylinder, as hereinafter described, reference being made to the accompanying drawings, in which- Figure 1 is a longitudinal sectional eleva= tion through the smoke-box and part of the boiler and also part of my improved superheating-receiver; and Fig. 2 is a transverse section on line 2 2 of Fig. 1, with a part of the receiver in section.

A represents the exhaust-pipe of the highpressure cylinder, and B represents the pipe through which the steam passes to the lowpressure cylinder. To each of these I attach at c, where they project into the smoke-box, a manifold D'instead of the usual conductingpipe, which being first extended upward a. suitable distance and also outward in the part 6, close to the shell 01, is in the part f prolonged lengthwise in the smoke-box g, preferably toward the forward end It, and suitably perforated in the upper side for recep tion of a series of small tubes 1', bent suitably to be expanded at their ends into the perfora= tions of the manifolds, respectively, and thus form numerous small conductors for the steam through the heating-space of the smoke-box in a way to greatly increase the amount of heating-surface to which the steam is exposed.

while passing through. These tubes will pref= erably be of copper for its better heat-com ducting property, but may of course be of any approved material. The special advantages of this form of superheater are its simplicity and cheapness of construction and its nominterference with accessto the ends of the boilertubes j for tightening or renewing them.

A deflecting-plate k and wire-netting dia= phragms Z m are employed to direct the gases for best effects on the superheater.

I claim In a compound locomotive engine the receiver in the smoke-box for the exhaust-steam from the high-pressure cylinder comprising a manifold attached to each of the steam-pipes where they project into the smoke-box and consisting of a part extending upward, and

also outward close to the shell of the smokebox and having a lengthwise extension of the upper portion along the smoke-box, and a se-' CARL J. MELL'IN.

Witnesses:

A. P. THAYER, O. SEDGWIOK. 

